What causes Achilles tendon pain?

What causes Achilles tendon pain?

Common causes of Achilles tendon pain are:

• Achilles tendinitis, inflammation (irritation) of the tendon.
• Achilles tendinosis, when the tendon starts to degenerate (break down) because of unresolved Achilles tendinitis.
• Achilles tendon rupture, a tear or break in the tendon.